Spanish moss is not a moss, but a flowering plant (Tillandsia usneoides) often seen draped from the branches of live oaks, cypress, and other large trees in the southeastern United States. The trees on which it grows provide support but no nutrients or moisture-the plant provides those things for itself, without apparently harming its support tree. This, then, is an example of a:

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Spanish moss is not harming its support tree and gets only support from it, making it an example of commensalism where one species benefits without affecting the other species positively or negatively.

Spanish Moss Is Not a Moss, but a Flowering Plant